Hi @sns,
- Yes, they are SharePoint Farm Administrator accounts.
- Yes, Farm account contains SharePoint Farm Administrator account and SharePoint Farm Service account. Also, an account may be both a SharePoint Farm Administrator account and a SharePoint Farm Administrator account.
- To retrieve the Farm Administrator accounts using PowerShell:
$WebApp = get-spwebapplication -includecentraladministration | where-object {$_.DisplayName -like "SharePoint Central Administration*"}
$Web = Get-SPweb($WebApp.Url)
$FarmAdminGroup = $Web.SiteGroups["Farm Administrators"]
$FarmAdminGroup.users
To retrieve the Farm service accounts using PowerShell:
(Get-SPFarm).DefaultServiceAccount.Name
To deploy 3rd party applications in the SharePoint farm, use this article to plan, configure, and maintain apps: Resources for apps for SharePoint. In you case, you can use the Farm Administrator account "SharePoint 2016 setup TST" account to deploy the 3rd party application.
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